Parallel Substrate Processing System with Retransfer Robots
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Solution Overview
Problem
The existing chemical-mechanical polishing (CMP) processes for semiconductor device manufacturing face inefficiencies due to long waiting times and sequential processing of substrates, which hinder the smoothing of insulators and complicate the addition of metal layers, necessitating a system that can perform transfers and polishing in parallel to enhance production efficiency.
Innovation Solution
A substrate processing system is designed with multiple processing lines and retransfer robots that enable simultaneous transfer and polishing of substrates across multiple stages and locations, reducing the substrate transfer path and increasing transfer efficiency by using rotating portions and carrier heads to manage substrates between polishing and cleaning lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sequential processing is used in CMP processes, then manufacturing precision can be maintained, but productivity decreases due to long waiting times and transfers
Solution Approach 1:
The system divides the processing into multiple parallel processing lines (first processing line with first polishing line and first cleaning line, second processing line with second polishing line and second cleaning line). Each line can independently process substrates, allowing simultaneous execution of multiple processes without interference, thereby reducing waiting time and improving productivity while maintaining quality standards
Solution Approach 2:
The patent introduces a time dimension by implementing parallel processing lines that operate simultaneously. Instead of sequential processing in a single line, multiple processing lines work in parallel, effectively converting a one-dimensional sequential process into a multi-dimensional parallel system, which dramatically reduces total processing time and waiting time between processes
2Productivity
If multiple processing lines are added to enable parallel processing, then productivity increases, but device complexity increases
Solution Approach 1:
The retransfer robots are designed with multi-functionality to operate across different processing lines and stages. The first retransfer robot transfers substrates from the front-end module to the first stage, while the second retransfer robot transfers substrates between multiple locations including first and second cleaning lines and stages. This universal design allows a single robot type to handle multiple tasks and locations, reducing the need for dedicated robots for each function and thereby limiting the increase in device complexity
Solution Approach 2:
The first stage and second stage act as intermediary transfer points between the front-end module, processing lines, and retransfer robots. These intermediate stages serve as buffer and transfer hubs that coordinate substrate movement between parallel processing lines, simplifying the control logic and physical layout by providing standardized interfaces rather than requiring direct complex connections between all components
Data Source
AI summary
A substrate processing system includes a front-end module, a first processing line including a first polishing line and a first cleaning line, a second processing line including a second polishing line and a second cleaning line and disposed in parallel to the first processing line, a first stage disposed between the first cleaning line and the second cleaning line, a first retransfer robot configured to transfer a substrate from the front-end module to the first stage, a second stage disposed between the first polishing line and the second polishing line, and a second retransfer robot configured to transfer the substrate between at least two locations of the first cleaning line, the second cleaning line, the first stage, and the second stage.